netdev - Re: Linux 4.15-rc3 (uml + bpf_perf

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Date:   Mon, 11 Dec 2017 09:27:40 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Richard Weinberger <richard@...ma-star.at>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        alexei.starovoitov@...il.com, brueckner@...ux.vnet.ibm.com
Subject: Re: Linux 4.15-rc3 (uml + bpf_perf_event.h)

On 12/11/2017 02:19 AM, Daniel Borkmann wrote:
> Hi Randy, hi Richard, [ +Hendrik for c895f6f703ad7dd2f ]
> 
> On 12/11/2017 09:32 AM, Richard Weinberger wrote:
>> Randy,
>>
>> Am Montag, 11. Dezember 2017, 03:42:12 CET schrieb Randy Dunlap:
>>> On 12/10/2017 06:08 PM, Linus Torvalds wrote:
>>>> Another week, another rc.
>>>
>>> um (uml) won't build on i386 or x86_64:
>>>
>>>   CC      init/main.o
>>> In file included from ../include/linux/perf_event.h:18:0,
>>>                  from ../include/linux/trace_events.h:10,
>>>                  from ../include/trace/syscall.h:7,
>>>                  from ../include/linux/syscalls.h:82,
>>>                  from ../init/main.c:20:
>>> ../include/uapi/linux/bpf_perf_event.h:11:32: fatal error:
>>> asm/bpf_perf_event.h: No such file or directory #include
>>> <asm/bpf_perf_event.h>
>>>                                 ^
>>> compilation terminated.
>>> ../scripts/Makefile.build:310: recipe for target 'init/main.o' failed
>>
>> How do you trigger that build failure?
>> Can you share your .config?

Richard, it's just defconfig on both i386 and x86_64.

> Hmm, too bad kbuild bot doesn't catch issues on uml. I'm not too familiar
> with uml, but looks like it's the only special case where there's no
> arch/um/include/uapi/asm/. What is the usual convention to pull in such
> headers in this case? Something like the below, would that fix it for you?
> 
> Thanks for your help,
> Daniel

Yes, that patch works.  Thanks.

>  arch/um/include/asm/bpf_perf_event.h | 1 +
>  include/asm-generic/bpf_perf_event.h | 1 +
>  2 files changed, 2 insertions(+)
>  create mode 100644 arch/um/include/asm/bpf_perf_event.h
>  create mode 100644 include/asm-generic/bpf_perf_event.h
> 
> diff --git a/arch/um/include/asm/bpf_perf_event.h b/arch/um/include/asm/bpf_perf_event.h
> new file mode 100644
> index 0000000..3097758
> --- /dev/null
> +++ b/arch/um/include/asm/bpf_perf_event.h
> @@ -0,0 +1 @@
> +#include <asm-generic/bpf_perf_event.h>
> diff --git a/include/asm-generic/bpf_perf_event.h b/include/asm-generic/bpf_perf_event.h
> new file mode 100644
> index 0000000..67112e5
> --- /dev/null
> +++ b/include/asm-generic/bpf_perf_event.h
> @@ -0,0 +1 @@
> +#include <uapi/asm-generic/bpf_perf_event.h>
> 


-- 
~Randy